BRAINCAKEExample Calculation - 4
This worked example uses uncertainty to evaluate an experimental result.
Question: in an experiment to measure the enthalpy change of neutralisation, the temperature of the mixture rose from 19.5 °C to 26.0 °C. The thermometer is read to ± 0.5 °C. The student's value was −45 kJ mol-1; the data book value is −57 kJ mol-1. Can the difference be explained by the uncertainty in the temperature measurement?
Step 1: percentage uncertainty in the temperature rise.
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Key terms in this lesson
- systematic error
- An error that shifts every reading by the same amount in the same direction, caused by the apparatus or method rather than chance.
More in Errors and Uncertainties
- Adding Uncertainties
- Adding Percentage Uncertainties
- Minimising Errors and Uncertainties
- Percentage Yield
- Atom Economy
- Example Calculation - 1
- Example Calculation - 2
- Example Calculation - 3
All 14 lessons in Errors and Uncertainties · All Edexcel AS-level Chemistry topics